CSC151.02 2003F, Class 27: Intersection

Admin:
* Questions on the lab?
* Friday the 13th falls on a Monday this week.
* Read *all* the problem.
* For tomorrow, reread the section on "Pair Recursion".
* Michael is scary.

NOTE: Today's class ended up detouring to a different topic: The problem of intersecting two lists.

The Coster Challenge: Rewrite intersection so that if a value appears multiple times on the right and left, it appears exactly that many times in the result.